Blindstitch felling machine



Dec. 24,1929. 7 s. G. TATE BLINDSTITCH FELLING MACHINE Fil'ed Aug. 26, 1927 "mnllll 6 Sheets-Sheet 'Dec. 24, 1929. s, TATE 1,740,882

BLINDSTITCH FELLING MACHINE Filed Aug. 26, 1927 6 Sheets-Sheet 2 U \k\ HHUWU H/Ii I i 93 W 3 a2 j g- I Z.

Dec. 24, 1929.

S. G. TATE BLINDSTITCH FELLING MACHINE Filed Aug. 26, 1927 i & R R

6 Sheets-Sheet 5 Dec. 24, 1929. s. a. TATE 1,740,882

BLINDSTITCH FELLING MACHINE Filed Aug- 26, 1927 6 Sheets-Sheet 4 a%o "i 50 6% 9/ 7 M 6/ 5/ 65 M i 6.? mum...-

Dec. 24, 1929. s. G. TATE 1,740,882

BLINDSTITCH FELLING MACHINE 6 Sheets-Sheet 5 Filed Aug. 26, 1927 Dec. 24, 1929. 5, (5, E 1,740,882

-BLINDSTITCH FELLING MACHINE Filed Aug. 26, 1927 6. Sheets-Sheet 6 Patented Dec. 24, 1929 uNrr STATES SAMUEL GEORGE TATE, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOB TO LEWIS INVISIBLE STITCH MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A COR- PORATION OF MAINE BLINDSTI'ICH FELLING MACHINE Application filed August 26, 1927.

This invention relates to new and useful improvements in blind stitch felling machines which are especially adapted for felling a superposed layer upon a base layer of material. The present invention is particularly intended for use in felling the edges of coatlinings to the body of the garment, the line of blind stitches connecting the superposed lining or layer and the base layer or body fabric, being disposed at a considerable distance from the infolded edge of the lining and extending parallel with said in folded edge whereby the infolded edge portion of the linin may afterwards be pressed down onto the base layer and thereby cover the line of blind stitches.

This invention embodies several improvements over the copending applications Serial No. 186,674, filed April 26, 1927, and Serial No. 215,701, filed Aug. 26, 1927, by Charles IV. Mueller.

Heretofore in stitching linings to the body fabric of coats, it has been customary to first superpose the lining on the body fabric, then inturn the edge portion of the lining, then to secure the lining to the body fabrlc 'by a second line of basting stitches disposed 111 parallelism with the first mentioned line of basting stitches and to leave a fullness of 1ming material between said lines of basting stitches, then to secure the extreme folded edge of the lining to the body fabric by a line of blind stitches, then to remove the line of basting stitches, then to remove the fullness to the lining by folding the same over the felled edge, then to press the lining and finally to remove the second formed line of basting stitches. This mode of operation decidedly objectionable for the reason that more or less fullness in the lining is liable to be formed and consequently the folded edge of the lining which overlaps and covers the line of blind stitches may or may not run straight. Furthermore, inasmuch as practice calls for an extended margin or overlapping portion of a uniform width, it will be readily apparent that if the two lines of basting stitches are not formed in straight lines and in exact parallelism the resultant Serial No. 215,702.

extended margin will vary to a corresponding extent.

To overcome the above objection, I first superpose a coat lining on the body fabric, then infold the marginal edge portion of the lining, and then secure said infolded edge portion to the body fabric along a line extending parallel with the folded edge and at a considerable distance therefrom. The assembly is then fed through the machine by an upper and lower feeding mechanism with the folded edge portion extending upwardly in a plane at substantially right angles to the body fabric, the under ply of the upturned folded edge portion being secured to the body fabric by a line of blind stitches which extend in close proximity to the line of basting stitches, thus insuring a uniform width or margin to the folded edge portion of the lining which overlaps the line of blind stitches.

In Muellers co-pending application No. 186,67 4 above referred to, a vibrating or shogging needle is employed which on one stroke engages the base layer or body fabric only and on the next stroke engages the upturned folded edge portion of the superposed layer or lining only, in combination with lower and upper plungers for alternately projecting nodes or ridges of the base and superposed layers respectively into the paths of needle movements.

In Muellers co-pending application No. 215,701, above referred to, a non-shogging needle is employed which reciprocates in the line of feed and which on one stroke engages the base layer only and on the next stroke engages the upturned folded edge portion of the superposed layer only.

One of the principal objects of the present invention is to provide a blind stitch felling machine for performing the above described operation and employing in said machine a non-shogging needle which oscillates in a single plane for successively engaging the base layer and the superposed layer during each penetrating stroke of said needle.

Another object is to provide a blind stitch felling machine for performing the above described operation and in employing in said machine upper and lower plungers for simultaneously projecting nodes of the upturned marginal portion of the superposed layer and the base layer into needle penetrating positions whereby said needle which oscillates in a constant plane will engage both of said nodes in succession.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings. I

In the drawings:

Figure 1 is an enlarged front elevation of the stitching head and work support of a sewing machine embodying my invention,

Figure 2 is an end elevation thereof,

Figure 3 is a rear elevation of the machine, parts thereof being shown in section,

Figure 4 is an enlarged top plan view of the main presser foot and the associated parts,

Figure 5 is a bottom plan View thereof,

Figure 6 is an enlarged detail plan view showing the mounting of the movable presser foot and the upper plunger.

Figure 7 is a transverse sectional view taken on the line 7-7 of Figure 4 and showing the fabrics in operative positions,

Figure 8 is a perspective view showing the means for mounting and operating the lower plunger,

Figure 9 is an enlarged perspective view showing more or less diagrammatically the positions of the upper and lower plungers at the time the needle is entering both nodes of materials formed by saidplungers,

Figure 10 is an enlarged horizontal sectional view showing more or less diagrammatically the positions of the upper and lower plunger, the presser foot and the guiding Wall,

Figure 11 is an enlarged vertical sectional view thereof, and

Figure 12 is a perspective view showing more or less diagrammatically the seam in the course of formation.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

The present invention is illustrated herein as embodied in a blind stitch sewing machine of the Lewis type, and comprises a frame which includes a base 5, a laterally extending work arm 6, a standard 7, an overhanging arm 8, and a stitching head 9 which is secured to the free end of the overhanging arm 8 and is disposed above the outer end of the work arm 6.

The felling operation for which this machine is particularly adapted is illustrated in Figs. 9, 10, 11 and 12. -In these figures I have shown a base layer A, which may be the body fabric of a coat,,and a superposed layer B,

which may be the lining therefor. The lining B has its marginal edge portion infolded, as indicated at b, and this infolded portion is secured to the body fabric A bysmeans of a line of basting stitches C which extends parallel to the folded edge portion and at a point somewhat removed therefrom so as to form a fairly wide marginal folded portion 7). The parts thus joined are fed through the sewing machine forming my invention with the marginal folded portion 6 turned up into a vertical plane. As the work is fed through the sewing machine, the upper and lower layers are united by a line of blind stitches S, said stitches including a plurality of needle thread loops 8 each of which enters and emerges from the base layer A and enters and emerges from the infolded edge portion 6 of the marginal folded portion 7) of the upper layer or lining B, said needle thread 5 loop being anchored by a bobbin thread If. The line of blind stitches S is located in close proximity to the corner or angle between the base layer and the marginal folded portion 7) whereby after the article has been felled, said marginal folded portion may be returned to its normal or horizontal position and thereby completely cover the line of formed blind stitches. The line of basting stitches C is then withdrawn.

The machine includes a stitch forming mechanism which I have indicated as a whole by the reference numeral 10, and a. work presenting mechanism which I have indicated as a whole by the reference numeral 11. Both the stitch forming mechanism 10 and the work presenting mechanism 11 are operated from a main rotary shaft 12 which extends longitudinally of the overhanging arm 8 and across the standard 7. A grooved pulley 13 is A fixed to the end of the shaft 12 opposite the stitching head 9 and is adapted to be driven by any suitable power.

The work presenting mechanism consists of a main presser foot 14 which is fixed to the stitching head 9, a work clamp 15 which cooperates with the work below said main presser foot, a lower feeding mechanism 16, an upper feeding mechanism 17, a lower plunger mechanism 18, an upper plunger mechanism 19, and a. movable presser foot 20.

The needle mechanism 10 includesa reciprocatory non-shogging needle 21 having its path of movement in a single plane parallel with the line of feed. the arm 22 of a needle lever 23 which is journaled on a fixed shaft 24 secured to the stitching head 9. The needle lever 23 is mounted on the stub shaft 24 for oscillatory movements only about said shaft. The other arm of the needle lever 23 is pivotally connected with the lower end of a link 27 the upper end of said link being pivotally connected as at 28 to one arm of a bell crank lever 30 which is journaled on the stitching head 9,

The needle 21 is secured to Ill) - in ach complete rotation of the main shaft 12 the needle 21 is thereby given a complete reciprocation in the line of feed.

Cooperating with the needle 21 to form a line of straight-away stitches is a rotary hook 37 and this hook is given two complete rotations to each reciprocation of the needle. The hook is fixed to a shaft 38 (see Fig. 3) and fixed to this shaft is a bevel gear 39 which is driven from a corresponding bevel gear 40 fixed on a vertical shaft 41 which is driven by said gear coupling 36 through a gear 42, the gear 42 and gear coupling 36' constituting a 2 to 1 gear coupling. Inasmuch as the gear coupling 39-40 is l to 1 coupling,

. the hook 37 will be rotated twice during each rotation of the main shaft 12.

The main presser foot 14 is fixedly secured to the lower portion of the stitching head 9 and cooperating with the underface of the presser foot is the work clamp 15, the lower feed mechanism 16, and the lower plunger mechanism 18.

The lower feeding mechanism 16 includes afeed dog 43 which is of the 4-m0tion type and the mechanism for operating this feed dog is substantially identical with that shown in the Mueller Patent 1,588,132, issued June 8, 1926. The backward and forward movement of the feed dog is obtained through the medium of a rock shaft 44, which I term the feed travel shaft, and the up and down movement of the feed dog is obtained from a rock shaft 45, which I term the feed lift shaft. These rock shafts 4445 extend longitudinally within the work arm 6 and have their righthand ends journaled in a bearing lug 6 and their lefthand ends journaled in suitable bearings.

In order to rock the feed travel shaft 44 and the feed lift shaft 45, I provide the main shaft 12 with two eccentrics. A connection rod 46 has its upper end engageable with one of said eccentrics and has its lower end pivotally connected to a rock arm 47 fixed to the feed travel shaft 44. A connection rod 48 has its upper end engageable with the other eccentric mounted on the main shaft and has its lower end pivotally connected to a rock arm 49 fixed to the feed lift shaft 45. The connection rods 46 and 48 are disposed within the standard 7 of the machine frame and the eccentrics which are mounted on the main shaft for actuating these rods are timed so as to bring about a. 4-motion movement to the feed dog.

As previously stated this particular machine is adapted for felling coat linings to the body fabric and this work is fed past the stitch forming mechanism whereby the needle during each penetrating stroke will successively enter the base layer, emerge therefrom, enter the superposed layer, and emerge therefrom. In order to position the base layer whereby the needle will penetrate and emerge therefrom, I have provided the lower plunger mechanism 18 which is illustrated and described in the co-pending application of Charles V. Mueller Serial No. 186,672, filed April 26, 1927, and which includes a vertically reciprocatory plunger for projecting a. node of the base layer material into needle penetrating position. For this purpose, I have provided the main or fixed presser foot 14 with a vertical opening 50 which is located directly below the stub shaft 24 which supports the needle lever 23. The plunger mechanism 18 includes a plunger 51 which is disposed directly below the opening 50 formed in the main presser foot. The plunger is reciprocated from a rock shaft 52 which extends within the work arm 6 and is suitably journaled therein.

It is desirable to reciprocate the lower plunger 51 during each reciprocation of the needle whereby the plunger will during its upward stroke form a node in the base layer and project said node into the path of the needle. To this end, I have provided the main shaft 12 with an eccentric 53 and have provided the plunger rock shaft 52 with a rock arm 54. A pitman 55 connects the eccentric 53 with the rock arm 54 so as to oscillate the rock shaft 52 during each rotation of the main shaft 12. The plunger 51 is mounted within the barrel 56 which is carried by a slide block 57, said block being slidably mounted for vertical movements in the outer end of the work arm 6. A rock arm 58 is connected to the plunger rock shaft 52 and a link 59 is pivotally connected at its ends to the block 57 and to the rock arm 58. As a result the rock shaft 52 will oscillate the rock arm 58 and through the medium of the link 59 and slide block 57, the plunger 51 will be reciprocated vertically. The rock arm 58 is connected to the plunger rock shaft 52 through the medium of an adjustable connection, which I have illustrated as a whole by the numeral 60, whereby the working position of the plunger 51 may be adjusted to suit fabrics of different thicknesses.

The main presser foot 14 includes a heel 61 and a toe 62, the opening 50 being located therebetween. The upper face of the toe 62 is provided with a needle guide 63 which extends in the line of feed and is disposed directly in front of the opening 50. The toe 62 is also provided with a longitudinally extending guideway 64 for the upturned folded portion 6 of the lining, as will be hereinafter fully explained. This guideway 64: extends in the line of feed and includes a vertical wall 65 which is carried by the toe 62. the wall extending in the line of feed and being disposed on the l-efthand side of the needle guide 63. The guideway extends from a point in front of the needle guide 68 to a point in rear of the opening 50 so as to guide the upturned folded portion 6 of the fabric in a vertical plane past the point of needle penetration. Located on the lefthand side of the guideway 64 is an offset presser foot portion 66 which supports the horizontally movable presser foot 20 and a horizontally reciprocable upper plunger 67, both the presser foot 20 and the plunger 67 being disposed in a vertical plane extending at right angles tothe line of feed and directly in rear of a plane parallel thereto which contains the lower plunger 51. p

The offset portion 66 of the main presser foot 14 is formed in upper face with a recess or seat 68 which extends across said portion from one side to the other. The movable presser foot 20 includes a foot porion 69 which is disposed within the guideway 64 for cooperation with the vertical wall 65, and a shank 70 which is mounted within the seat or recess 68 for relative sliding movement. The foot portion 69 extends across an opening 71 formed in the lower portion of the vertical guiding wall 65 at a point in alinement with the opening 50. The upper horizontal plunger 67 is slidably mounted in a guiding groove 72 formed in the lower face of the shank 70 of said presser foot 20,

the guiding groove extending longitudinally of the shank and also extendingthrough the foot portion 69 so as to position said upper plungerli? in alinement with the opening 70. The plunger 67 includes at its inn-er end a downwardly extending stop 73 which coop crates with a vertical wall 74; formed on the offset portion 66 of. the main presser foot to limit the outward movement of said upper plunger. The outer end of the upper plungor 67 is provided with an upwardly extending arm 75 forming a resultant stop shoulder 76 at its inner vertical edge. The arm 75 is bent rearwardly to form a bearing arm 77. The arm 7 5 is adapted to slide within a correspondingly shaped recess 7 8 formed in the outer end of the shank 70 of the presser foot 20. Formed in the shank 70 and opening into the recess 78 is a seat 79 for receiving the inner end of a coiled spring 80, the outer end of said spring extending within the re cess 78 and engaging the shoulder 76 formed onthe upper plunger 67. As a result, the spring 80 tends to push the upper plunger 67 outwardly to its limit of movement which is fixed by the stop arm 7 5 engaging the shoulder 76. Simultaneously the spring 80 exerts an inward pressure against the movable presser foot 20 so as to yieldably hold said presser foot against the vertical guide wall 65. Thus the. movable presser foot 20 is yieldably held against the guiding wall 65 and simultaneously the upper plunger 67 is yieldably held in its inoperative position at one side of the guideway 64. A cover plate 81 is secured to the presser foot 14.- by screws 8282 and extending upwardly through an opening formed in said cover plate is an arm 83 which is fixed to the movable presser foot 20 and is adapted to be engaged by a lever 84 for moving said presser foot 20 outwardly against the tension of the spring 80.

The upper feeding mechanism 17 cooperates with the lower feeding mechanism 16 to feed both the upper and lower layers of material in unison. This upper feeding mechanism forms the subject matter of an application Serial No. 186,673, filed April 26 1927, by Charles W. Mueller, and includes a feed dog 85 which is fixed to a feed bar 86. The feed dog 85 is provided with a series of fabric engaging teeth 67, and this dog is mounted for feeding movements in a horizontal. plane, that is, the feeding movements of the upper feed dog are in a. plane at right angles to the feeding movements of the lower feed dog. The upper feed dog 85 is located in rear of the offset portion 66 of the main presse" foot l-l and the teeth 87 cooperate with that portion of the guiding wall 65 which extends in rear of the movable presser foot 20. F our motions are imparted to the feed dog 85, that is. back and forth and in and out, the back and forth movements being in the line of feed, whereas the in and out movements are in a plane transverse to the line of feed. The feeding movements of the feed dog 85 are in unison with the feeding movements of the lower feed dog a3. In order to reciprocate the upper feed dog 85 forwardly and backwar-dly, T have provided a vertically extending lever 88 which is fulcrumed on a horizontal axis 89 on the rear face of the stitching head 9 and the lower end of the lever 88 being pivetally connected to the feed bar 86 by right angle connections 90-91, the former being a horizontal pivot and the latter a vertical pivot. The upper end of the lever 88 is adjustably connected as t 92 with one end of a link 93, the other end of the link being journaled on an eccentric pin 94 fixed to the jack shaft 35.

Inasmuch as the jack shaft 35 is driven by a l to 1 gear coupling 36, it will be apparent that the upper feed dog will be given a complete backward and forward movement during each complete rotation of the main shaft 12 or during one complete oscillation of the needle 21. part in and out movements to the upper feed dog 85, I have provided the feed bar 86 with an upwardly extending slide plate 95. This plate is preferably formed integral with the feed bar 86 and extends longitudi- Tn order to imnally of said bar. An operating lever 96 has its lower end slotted to form a fork for engaging the slide plate 95. The lever 96 is fulcrumed intermediate its ends on a crank pin 97 fixed to acrank arm 98 mounted on a crank shaft 99 which is journaled in the stitching head 9 with its axis parallel to the line of feed. The upper end of the operating lever 96 is provided with a cam roller 100 which has direct contact with a peripheral cam 101 fixed to a shaft 102 journaled in the head 9 and driven from the shaft 41 by a 1 to 4 gear coupling 103. A spring 104 has one end connected to the upper end of the operating lever 96 and the other end connected to the stitching head 9 for yieldably retaining the cam roller 100 in engagement with the cam 101. The cam 101 is formed with opposed high points it and 2' of equal radius, and inasmuch as the shaft 102 makes one complete rotation to every two complete rotations of the main shaft 12, it will be apparent that the operating lever 96 will be given a complete oscillation during each complete rotation of the main shaft 12.

The lever 84; which cooperates with the upwardly extending arm 83 of the movable presser foot 20 has its upper end fixed to the crank pin 97.

In order to reciprocate the upper plunger 67 in timed relation to the needle penetrations and in unison with the lower plunger 51, I have provided an operating lever 105 which is fulcrumed intermediate its ends on a crank pin 106 fixed to a crank arm 107 carried by a crank shaft 108 which is mounted for oscillations in the stitching head 9, the axis of the shaft being parallel to the crank shaft 99. Fixed to the rear end of the crank shaft 108 is a stop arm 109 which is adapted to slide in a groove formed in said stitching head. This groove extends vertically and one wall thereof limits the amount of oscillation not only of the stop arm 109 but also of the crank shaft 108. A spring 110 has one end connected to the stop arm 109 and the other end connected to the stitching head 9. This spring 110 serves to hold the arm 109 against the side wall of the groove and thereby yieldably retain the crank shaft 108 against oscillation. The upper end of the lever 105 carries a cam roller 111 which is yieldably held by the spring 80 of the movable presser foot 20 in direct contact with a peripheral cam 112 fixed to the shaft 102. The lower end of the operating lever 105 carries an adjusting screw 113 for direct contact with the bearing arm 77 of the upper plunger 67. The cam 112 isformed with opposed high points j and 7c of equal radius, and inasmuch as the shaft 102 makes one complete rotation to every two complete rotations of the main shaft 12, it will be apparent that the operating lever 105 will be given a complete oscillation during each complete rotation of the main shaft 12. Consequently, the upper plunger 67 is moved forwardly to project a node of the upturned marginal portion 6 of the lining into needle penetrating position for each penetrating stroke of the needle. The eccentric 53 which actuates the lower plunger 51, and the cam 112 which actuates the upper plunger 67 are timed in unison whereby both plungers will be simultaneously moved to project nodes of the lower and superposed layers into needle penetrating positions during each reciprocation of the needle whereby said needle will enter and emerge from both nodes in succession during each penetrating movement thereof.

In the operation of my invention for felling coat linings, the base layer A and the superposed layer or lining B are first united by the line of basting stitches C, the basting stitches also serving to anchor the infolded edge portion 5 of the folded marginal portion Z) of the lining.

The work is then fed into the machine, the base layer A being positioned between the main presser foot 20 and the lower feed dog 43 and the work clamp 15, the main portion of the lining B being disposed under the left side of the main presser foot 14, and the upturned marginal edge portion 6 of the lining being directed into the vertical guideway 6%. Thus the base layer A is directly engaged by the lower feed dog 13 and the upturned marginal edge portion 5 of the lining is directly engaged by the upper feed dog 85. The two feed dogs operate in planes at right angles to each other and are intermittently actuated in unison to feed both layers of fabric past the stitch forming mechanism, thus avoiding all drag to the superposed layer or lining B. lVhile the needle 21 is at the forward end of its stroke, both the lower plunger 51 and the upper plunger 67 will be moved in unison to working positions thereby respectively projecting nodes of the base layer A and the marginal portion 7) of the lining into needle penetrating position. Inasmuch as the upper plunger 67 operates in a plane directly in rear of the plane containing the lower plunger 51, the needle in its forward movement will engage both of said nodes in succession, the needle first entering the node of the base layer, then emerging therefrom, then entering the node of the superposed layer, and then emerging therefrom. This forward movement of the needle projects a needle thread loop .9 through both nodes and while the needle is at the rear end of its stroke the rotary hook 37 functions to pass the bobbin thread 25 through said needle thread loop and thereby anchor the latter. The needle during its return movement is withdrawn from both of said nodes, both plungers are returned to their initial positions, and as soon as the needle has been withdrawn from engagement with the base layer,

the work is moved rearwardly by the upper and lower teed mechanisms a distance equal to the length of one stitch. Thus a complete cycle of operation has been completed.

It is of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination of a reciprocatory needle and a complemental stitch forming mechanism, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer past the stitch forming mechanism, and means operable during each reciprocation of the needle for projecting a node of the superposed layer and a node of the base layer into needle penetrating positions whereby the needle during each reciprocation will engage both of said nodes in succession and cooperate with said complemental stitch forming mechanism.

2. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination of a reciprocatory needle and a complemental stitch forming mechanism, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer past the stitch forming mechanism, and separate means operable during each reciprocation of the needle and disposed one in front of the other for'projecting a node of the superposed layer and a node of the base layer into needle penetrating positions whereby the needle during each reciprocation will engage both of said nodes in succession and cooperate with said complemental stitch forming mechanism.

3' In a blind stitch sewing machine for felling a superposed layer to a base layer, the combination of a reciprocatory needle and a complemental stitch forming mechanism, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer pastthe stitch forming mechanism, upper and lower reciprocatory plungers operable during each reciprocation of the needle for respectively projecting a node of the superposed layer and a node of the base layer into needle penetrating positions whereby the needle during each reciprocation will engage both of said nodes in succession and cooperate with said complemental stitch forming mech anism, and means for clamping the upturned edge portion-of the superposed layer and the base layer on opposite sides of the respective plungers during the node forming movements of said plungers.

4. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination of a reciprocatory needle and a complemental stitch forming mechanism, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer past the stitch forming mechanism, an upper plunger reciprocatory in a horizontal plane at right angles to the line of teed for projecting a node of the superposed layer into needle penetrating positions, a lower plunger reciprocatory in a vertical plane for projecting a node of the base layer into needle penetrating position, and means for reciprocating said plungers in unison whereby the needle during each reciprocation will engage both of said nodes in succession and cooperate with said complemental stitch forming mechanism.

5. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination of a reciprocatory needle and a complemental stitch forming mechanism, and a work presenting mechanism including means for directing the base layer and the upturned ec ge portion of the superposed layer past the stitch forming mechanism, an upper plunger reciprocatory in a horizontal plane at right angles to the line of feed for projecting a node of the superposed layer into needle penetrating positions, a lower plunger reciprocatory in a vertical plane for projecting a node of the base layer into needle penetrating position, one of said plungers being disposed in front of the other, and means for reciprocating said plungers 'in unison whereby the needleduring each reciprocation will engage both of said nodes in succession and cooperate with said. complemental stitch forming mechanism.

6. In a blind stitch sewing machine for telling a superposed layer upon a base layer of material, the combination with a work support, of a needle reciprocable in the general direction of the line of feed and complemental stitch torming mechanism, and work presenting mechanism including means operable during each reciprocation of the needle for intermittently and simultaneously projecting a node of the base layer and a node of the upturned edge portion of the super posed layer to needle penetrating positions.

7. In a blind stitch sewing machine for felling a superposed layer upon a base layer of material, the combination with a work support, of a needle reciprocable in the general direction of the line of feed and complemental stitch forming mechanism, and work presenting mechanism including means for intermittently and simultaneously projecting a node of the base layer and a node of the upturned edge portion of the superposed layer to needle penetrating positions, and separate means for clamping the upturned edge portion of the superposed layer and the base layer during the formation of said nodes therein.

8. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination with a stitch forming mechanism including a non-shogging needle reciprocatory in a single plane in the line of feed, and a work presenting mechanism including means for directing the base layer and the upturned edge portion oi the superposed layer past the stitch forming mechanism, and means operable during each reciproca tion of the needle projecting a node of the superposed layer and a node of the base layer into needle p netrating position whereby the needle during-each reciprocation will engage both of said nodes separately in succession.

9. In a blind stitch sewing machine for telling a snoerposed layer to a base layer, t 1e combine. n with a stitch forming mechanism including a non-shogging needle reciprocatory in a single plane in the line of feed, and a work presenting mechanism including means for directing the base la er and the upturned edge portion of the superposed layer past the stitch forming mechanism, and separate means operable during each reciprocation or" the needle and disposed one in front of the other for projecting a node of the superposed layer and a node of the base layer into needle penetrating positions whereby the needle during each reciprocation will engage both of said nodes in succession.

10. In a blind stitch sewing lnachine for telling a superposed layer to a base layer, the combination with a stitch forming mechanism including a non-shogging needle reciprocatory in a single plane in the line of feed, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer past the stitch forming mechanism, upper and lower reciprocatory plungers operable during each reciprocation of the needle for respectively projecting a node of the superposed layer and a node of the base layer into needle penetrating positions Whereby the needle during each reciprocation will engage both of said nodes in succession and cooperate with said complemental stitch forming mechanism, and means for clamping the upturned edge portion of the superposed layer and the base layer on opposite sides of the respective plungers during the node forming movements of said plungers.

ll. In a blind stitch sewin machine for telling a superposed layer to a base layer, the combination with a stitch forming mechanism including a non-shogging needle reciprocatory in a single plane in the line of feed, and a work presenting mechanism including means for directing the base layer and the upturned edge portion of the superposed layer past the stitch forming mechanism, an

upper plunger reciprocatory in a horizontal plane at right angles to the line of feed for projecting a node of the superposed layer into needle penetrating positions, a lower plunger reciprocatory in a vertical plane for projecting a node of the base layer into needle penetrating position, and means for reciprocating said plungers in unison whereby the needle during each reciprocation will engage both oat said nodes in succession and cooperate with said complemental stitch forming mechanism.

12. In a blind stitch sewing machine for telling a superposed layer to a base layer, the combination with a stitch forming mechanism including a non-shogging needle reciprocatory in a single plane in the line of feed, and a work oresenting mechanism including upper and lower feeding means respectively cooperating with the upturned edge portion of the superposed layer and with the base layer for feeding said layers in unison past the stitch forming mechanism, and means operable during each reciprocation of the needle for projecting a node of the superposed layer and a node of the base layer into needle penetrating position whereby the needle during each reciprocation will engage both of said nodes in succession.

In testimony whereof I hereunto aflix my signature.

SAMUEL GEORGE TATE. 

